[@netweb Keymaster 12 years, 1 month ago]

Add the following CSS to your custom CSS and you should be good to go:

#bbpress-forums span.bbp-author-ip {
word-wrap: break-word;
}

I have added word-wrap: break-word; to bbPress CSS in #2675

span.bbp-author-ip {
	font-family: 'Helvetica Neue', Arial, Helvetica, 'Nimbus Sans L', sans-serif;
	font-size: 11px;
	font-weight: bold;
	word-wrap: break-word;
	color: #aaa;
}